The Detroit is a full diff, not a drop-in like the Lockrights and Aussies. It requires full disassembly, and an experienced hand with specialty tools for assembly. It IS one of the toughest, most dependable lockers you can get, though, so it's worth the effort--those that you can put in yourself are fine for a while, but they'll break easier than a full-diff style if you plan to pound on it much. There are numerous places that carry Detroits, as it is very popular (Trail-Gear, Marlin Crawler, Randy's Ring & Pinion, to name a few, but just about everyone carries it).